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Home , Catskill Formation, Kinzers Formation, Lock Haven Formation, Pocono Formation, Reedsville Formation, Rockdale Run Formation

POLYGON ATTRIBUTES FOR "BEDROCK GEOLOGY OF "

UNITNO: A unique number assigned to each map unit in the data sets for geologic units and dikes. The number, which is not derived from the 1980 map, places the units approximately, but not completely, in a sequence ranging from those having the youngest ages (lower numbers) to those having the oldest ages (higher numbers). In the data set for geologic units, there are 193 unique unit numbers ranging from 1 to 195 (unit number 6, kimberlite, and unit number 15, Quarryville Diabase, occur only in the data set for dikes). Units 8 (diabase), 163 (pegmatite), and 183 (metadiabase) occur in both the data set for geologic units and the data set for dikes.

MAP_SYMBOL: The symbol used to label the unit on the 1980 state geologic map, except where modified as indicated in "changes.pdf." Please note that the "double-bar P" shown on the 1980 map to indicate units of age has been changed to "P," the special character for Triassic units (capital "T" joined to small capital "R") has been changed to "Tr,"and the special character for units of age ("C" with horizontal bar) has been changed to "C" in the attribute table.

NAME: The name of the geologic unit in the explanation of the 1980 state geologic map (Berg and others, 1980), except where modified as indicated in "changes.pdf."

AGE: The age of the geologic unit as shown on the 1980 state geologic map (Berg and others, 1980). Ages are at the level of a geologic period.

LITH1: The dominant lithology, volumetrically, in the rock unit. Lithologies were modified from the geologic description in the map explanation of the 1980 state geologic map (Berg and others, 1980), based on reviews by staff geologists of the Pennsylvania Geological Survey in 1998 and 2000. The lithologies are assigned based on the entire areal extent of the geologic unit within Pennsylvania; thus, all lithologies listed (particularly in the LITH3 item) may not be present in local areas.

LITH2: The secondmost dominant lithology, volumetrically, in the map unit. See LITH1 above for source.

LITH3: Other major lithologies, volumetrically, in the rock unit. See LITH1 above for source.

1 MAP_ UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 1 Qs Sands of Presque Isle Quaternary Sand 2 Qt Trenton Gravel Quaternary Gravelly sand Sand Clay-silt; alluvium; swamp deposits

3 Tpb Pensauken and Bridgeton Tertiary Feldspathic quartz Gravel Clay; silt Formations, undifferentiated sand 4 Tbm Bryn Mawr Formation Tertiary Gravelly sand Silt 5 Kp Patapsco(?) Formation Cretaceous Ferruginous clay Sand 7 Js Sedimentary strata at Arkosic ; siltstone; conglomerate Jacksonwald and Aspers 8 Jd Diabase Jurassic Diabase 9 Trg Gettysburg Formation Triassic Silty mudstone Shale Sandstone; limestone 10 Trb Brunswick Formation Triassic Mudstone Siltstone Shale; argillite 11 Trfl Limestone fanglomerate Triassic Limestone conglomerate 12 Trfq Quartz fanglomerate Triassic Quartz conglomerate 13 Trh Hammer Creek Formation Triassic Sandstone Siltstone Mudstone 14 Trgh Heidlersburg Member of Triassic Shale Argillite Arkosic sandstone; quartz Gettysburg Formation conglomerate; limestone conglomerate 16 Trl Lockatong Formation Triassic Argillite Black shale Limestone; calcareous shale 17 Trgc Gettysburg conglomerate Triassic Quartz conglomerate Sandstone Siltstone; mudstone 18 Trhc Hammer Creek conglomerate Triassic Quartz conglomerate Sandstone 19 Trn New Oxford Formation Triassic Arkosic sandstone Shale Mudstone; sandstone 20 Trs Stockton Formation Triassic Arkosic sandstone Siltstone Sandstone; mudstone 21 Trnc New Oxford conglomerate Triassic Quartz conglomerate 22 Trsc Stockton conglomerate Triassic Quartz conglomerate Conglomeratic sandstone 23 Pg Sandstone Shale Limestone; 24 Pw Washington Formation Permian Sandstone Shale Limestone; coal 25 PPw Waynesburg Formation Permian and Sandstone Shale Limestone; coal Pennsylvanian 26 Pm Monongahela Group Pennsylvanian Limestone Shale Sandstone; coal 27 Pc Pennsylvanian Shale Siltstone Sandstone; limestone; coal 28 Pcc Pennsylvanian Shale Siltstone Sandstone; limestone; coal 29 Pcg Pennsylvanian Shale Sandstone Limestone; coal 30 Pap Allegheny and Pottsville Pennsylvanian Sandstone Shale Conglomerate; coal Formations, undivided 31 Pa Pennsylvanian Sandstone Shale Limestone; clay; coal

2 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 32 Pl Llewellyn Formation Pennsylvanian Sandstone Siltstone Shale; conglomerate; coal 33 Pp Pennsylvanian Sandstone Conglomerate Shale; siltstone; claystone; limestone; coal 34 Mmc Shale Siltstone Sandstone; conglomerate; limestone 35 Mbc Burgoon Sandstone through Mississippian Sandstone Shale Siltstone; conglomerate Cuyahoga Group, undifferentiated 36 Mb Burgoon Sandstone Mississippian Sandstone Conglomerate Shale; coal

37 Mp Mississippian Sandstone Siltstone Conglomerate 38 Msc Shenango Formation through Mississippian Sandstone Siltstone Shale Cuyahoga Group, undivided 39 Ms Shenango Formation Mississippian Sandstone Shale Siltstone 40 Mc Cuyahoga Group Mississippian Siltstone Shale Sandstone 41 MDpr Pocono and Rockwell Mississippian and Sandstone Conglomerate Shale Formations, undivided 42 MDsr Shenango Formation through Mississippian and Sandstone Siltstone Shale Riceville Formation, undivided Devonian 43 MDso Shenango Formation through Mississippian and Sandstone Siltstone Shale Oswayo Formation, undivided Devonian 44 MDr Mississippian and Argillaceous Shale Carbonaceous shale; Devonian sandstone conglomerate; diamictite 45 MDhm Huntley Mountain Formation Mississippian and Sandstone Siltstone Shale Devonian 46 MDsk Spechty Kopf Formation Mississippian and Sandstone Siltstone Polymictic diamictite; mudstone; Devonian laminite; shale; conglomerate 47 Dbr through Devonian Sandstone Siltstone Shale Riceville Formation, undivided 48 Dcr Corry Sandstone through Devonian Sandstone Siltstone Shale Riceville Formation, undivided 49 Dbv Berea Sandstone through Devonian Sandstone Siltstone Shale; conglomerate Venango Formation, undivided 50 Dv Venango Formation Devonian Siltstone Sandstone Shale; conglomerate 51 Dck Devonian Sandstone Siltstone Shale; conglomerate; mudstone 52 Dcb Buddys Run Member of Catskill Devonian Siltstone Mudstone Sandstone Formation

3 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 53 Dcd Duncannon Member of Catskill Devonian Sandstone Siltstone Mudstone; conglomerate Formation 54 Dch Chadakoin Formation Devonian Siltstone Sandstone Shale 55 Dg Girard Shale Devonian Argillaceous shale Siltstone 56 Dne Northeast Shale Devonian Shale Siltstone 57 Dccf Clarks Ferry Member of Catskill Devonian Sandstone Siltstone Conglomerate Formation 58 Dcsc Sherman Creek Member of Devonian Mudstone Siltstone Sandstone Catskill Formation 59 Dcbs Berry Run and Sawmill Run Devonian Sandstone Siltstone Mudstone Members of Catskill Formation, undivided 60 Dcpp Poplar Gap and Packerton Devonian Sandstone Conglomerate Siltstone Members of Catskill Formation, undivided 61 Dcpg Poplar Gap Member of Catskill Devonian Sandstone Conglomerate Siltstone Formation 62 Dcp Packerton Member of Catskill Devonian Sandstone Conglomerate Siltstone Formation 63 Dclr Long Run Member of Catskill Devonian Sandstone Siltstone Mudstone Formation 64 Df Devonian Sandstone Siltstone Shale; conglomerate 65 Dciv Irish Valley Member of Catskill Devonian Siltstone Mudstone Sandstone Formation 66 Ds Scherr Formation Devonian Siltstone Sandstone Shale; mudstone 67 Dclw Long Run and Walcksville Devonian Sandstone Siltstone Mudstone Members of Catskill Formation, undivided 68 Dlh Devonian Mudstone Siltstone Sandstone; conglomerate 69 Dcbr Beaverdam Run Member of Devonian Siltstone Sandstone Shale Catskill Formation 70 Dcwt Walcksville and Towamensing Devonian Sandstone Siltstone Mudstone; shale Members of Catskill Formation, undivided 71 Dcw Walcksville Member of Catskill Devonian Sandstone Siltstone Mudstone Formation 72 Dct Towamensing Member of Devonian Sandstone Siltstone Shale Catskill Formation

4 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 73 Dbh Brallier and Harrell Formations, Devonian Siltstone Shale Black shale undivided 74 Dtr Trimmers Rock Formation Devonian Siltstone Shale Sandstone; black shale 75 Dh Devonian Shale Siltstone Black shale; argillaceous limestone; sandstone; limestone; bentonite 76 Dmh Devonian Shale Siltstone Argillaceous limestone; sandstone

77 Dm Devonian Black shale Limestone Bentonite 78 Doo Onondaga and Old Port Devonian Calcareous shale Sandstone Limestone; argillaceous limestone; Formations, undivided chert; shale; siliceous siltstone; bentonite 79 Don Onondaga Formation Devonian Calcareous shale Argillaceous Bentonite limestone 80 Dbe Buttermilk Falls Limestone Devonian Siliceous sandstone Limestone Siltstone; shale; chert through Esopus Formation, undivided 81 Dor Ridgeley Member of Old Port Devonian Sandstone Formation 82 Drc Ridgeley Formation through Devonian Sandstone Siltstone Shale; limestone; chert Coeymans Formation, undivided 83 Dosn Shriver, Mandata, Corriganville, Devonian Limestone Chert Shale; siliceous siltstone and New Creek Members of Old Port Formation, undivided

84 DSop Onondaga Formation through Devonian and Shale Sandstone Limestone; dolomite; siltstone Poxono Island Formation, undivided 85 DSkt Keyser and Tonoloway Devonian and Limestone Shale Formations, undivided Silurian 86 DSkm through Devonian and Limestone Shale Siltstone; sandstone; mudstone; Mifflintown Formation, Silurian dolomite undivided 87 DSkc Keyser Formation through Devonian and Limestone Shale Sandstone; siltstone; mudstone; Clinton Group, undivided Silurian dolomite

5 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 88 Swm through Silurian Calcareous shale Siltstone Shale; sandstone; limestone; Mifflintown Formation, mudstone undivided 89 Swc Wills Creek Formation Silurian Calcareous shale Siltstone Shaly limestone; dolomite 90 Sdp Decker Formation through Silurian Calcareous sandstone Limestone Siltstone; shale; dolomite Poxono Island Formation, undivided 91 Sbm Bloomsburg and Mifflintown Silurian Shale Siltstone Sandstone; limestone; mudstone Formations, undivided 92 Sb Silurian Shale Siltstone Sandstone; mudstone 93 Ss Shawangunk Formation Silurian Sandstone Conglomerate Shale

94 Sc Clinton Group Silurian Shale Limestone Sandstone; ferruginous sandstone

95 St Tuscarora Formation Silurian Quartzitic Shale; siltstone; conglomerate sandstone 96 Ojb Juniata and Bald Eagle Sandstone Siltstone Shale; conglomerate Formations, undivided 97 Oj Ordovician Sandstone Siltstone Shale 98 Obe Ordovician Sandstone Siltstone Shale; conglomerate 99 Or Ordovician Shale Siltstone Sandstone; black shale 100 Om Ordovician Shale Siltstone Slate 101 Omgs Graywacke and shale of Ordovician Graywacke Shale Sandstone Martinsburg Formation 102 Oml Limestone of Martinsburg Ordovician Argillaceous limestone Shale Formation 103 Oh Hamburg sequence rocks Ordovician Shale Siltstone Graywacke 104 Ohsg Shale and graywacke of Ordovician Shale Graywacke Hamburg sequence 105 Ohg Graywacke of Hamburg Ordovician Graywacke sequence 106 Ohl Limestone of Hamburg Ordovician Limestone sequence 107 Ohjv Jonestown Volcanic Suite Ordovician Andesite Metadiabase 108 Oco Cocalico Formation Ordovician Shale Siltstone Argillaceous sandstone

6 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 109 Ocl Coburn Formation through Ordovician Limestone Calcareous Dolomitic limestone; shaly Loysburg Formation, undivided shale limestone; argillaceous, dolomitic limestone; high-calcium

110 Ocn Coburn Formation through Ordovician Limestone Calcareous Shaly limestone; metabentonite Nealmont Formation, undivided shale

111 Oc Chambersburg Formation Ordovician Argillaceous limestone Shale Metabentonite

112 Oha Hershey Formation through Ordovician Argillaceous limestone Limestone High-calcium limestone Annville Formation, undivided 113 Ohm Hershey and Myerstown Ordovician Argillaceous limestone Limestone Formations, undivided 114 Ojk Jacksonburg Formation Ordovician Shaly limestone Limestone 115 Obv Valentine Member of Benner Ordovician High-calcium Formation limestone 116 Obl Benner Formation through Ordovician Limestone Dolomitic Argillaceous, dolomitic limestone; Loysburg Formation, undivided limestone high-calcium limestone; dolomite; metabentonite

117 Osp St. Paul Group Ordovician Limestone Chert Dolomite 118 Oan Annville Formation Ordovician High-calcium limestone 119 Ob Ordovician Limestone Dolomite Chert 120 Oba Bellefonte and Axemann Ordovician Dolomite Limestone Sandstone Formations, undivided 121 Obf Bellefonte Formation Ordovician Dolomite Sandstone 122 Ops Pinesburg Station Formation Ordovician Dolomite Limestone 123 Oo Ontelaunee Formation Ordovician Dolomite Limestone Chert 124 Orr Ordovician Limestone Dolomite Chert 125 Oa Axemann Formation Ordovician Limestone 126 Oe Epler Formation Ordovician Limestone Dolomite 127 Ons Nittany and Stonehenge/Larke Ordovician Dolomite Limestone Chert Formations, undivided 128 On Nittany Formation Ordovician Dolomite Chert 129 Ori Rickenbach Formation Ordovician Dolomite Chert 130 Osl Stonehenge/Larke Formation Ordovician Limestone Dolomite

7 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 131 Os Stonehenge Formation Ordovician Limestone Conglomer- atic, siliceous limestone 132 OCc Conestoga Formation Ordovician and Limestone Shale Conglomeratic limestone; phyllite Cambrian 133 Cg Gatesburg Formation Cambrian Dolomite Limestone Sandstone; chert 134 Cgm Mines Member of Gatesburg Cambrian Dolomite Chert Formation 135 Csg Shadygrove Formation Cambrian Limestone Chert 136 Cr Richland Formation Cambrian Dolomite Limestone Chert 137 Cal Allentown Formation Cambrian Dolomite Limestone Calcareous siltstone; chert 138 Cgl Lower members of Gatesburg Cambrian Sandstone Dolomite Limestone Formation, undivided 139 Cz Zullinger Formation Cambrian Limestone Dolomite Quartz sandstone 140 Cw Warrior Formation Cambrian Limestone Dolomite Sandstone 141 Cms Millbach and Schaefferstown Cambrian Limestone Dolomite Formations, undivided 142 Cm Millbach Formation Cambrian Limestone Dolomite 143 Ce Cambrian Calcareous shale Silty limestone Limestone; dolomite

144 Cph Pleasant Hill Formation Cambrian Argillaceous limestone Shale Siltstone; sandstone

145 Csb Snitz Creek and Buffalo Springs Cambrian Limestone Dolomite Sandstone Formations, undivided 146 Csc Snitz Creek Formation Cambrian Dolomite Limestone Sandstone 147 Clv Leithsville Formation Cambrian Dolomite Shaly Chert; shale dolomite 148 Cbs Buffalo Springs Formation Cambrian Limestone Dolomite Sandstone 149 Cul Lower (Middle?) Cambrian Cambrian Dolomite Limestone Tectonic slices of shale, quartzite, rocks, undivided phyllite, and schist 150 Czc Zooks Corner Formation Cambrian Dolomite Silty to sandy dolomite

151 Cl Ledger Formation Cambrian Dolomite Siliceous dolomite 152 Ck Cambrian Shale Limestone Sandy limestone 153 Cwb Cambrian Shale Sandstone Conglomerate; dolomite; limestone

8 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 154 Ct Tomstown Formation Cambrian Dolomite Shale 155 Cv Vintage Formation Cambrian Argillaceous dolomite Limestone

156 Cah Antietam and Harpers Cambrian Quartzite Phyllite Schist Formations, undivided 157 Ca Cambrian Quartzite Quartz schist 158 Cha Hardyston Formation Cambrian Quartzite Feldspathic Quartz-pebble conglomerate sandstone 159 Ch Cambrian Phyllite Schist Quartzite 160 Chm Montalto Member of Harpers Cambrian Quartzite Formation 161 Cch Chickies Formation Cambrian Quartzite Quartz schist Slate; conglomerate 162 Cwl Weverton and Loudoun Cambrian Quartzite Quartzose Slate; arkosic sandstone Formations, undivided conglomerate 163 Xpg Pegmatite Probably lower Granitic pegmatite Paleozoic 164 Xa Anorthosite Probably lower Anorthosite Paleozoic 165 Xgr Granitic gneiss and granite Probably lower Granitic gneiss Granite Granodiorite Paleozoic 166 Xmgh Mafic gneiss Probably lower Mafic gneiss Paleozoic 167 Xmgp Mafic gneiss Probably lower Mafic gneiss Paleozoic 168 Xmg Metagabbro Probably lower Metagabbro Hornblende Paleozoic gneiss 169 Xu Ultramafic rocks Probably lower Serpentinite Pyroxenite Steatite Paleozoic 170 Xpb Peach Bottom Slate and Cardiff Probably lower Slate Quartz Conglomerate, undivided Paleozoic conglomerate

171 Xpc Peters Creek Schist Probably lower Chlorite-sericite schist Quartzite Paleozoic 172 Xm Marburg Schist Probably lower Phyllite Mica-chlorite Conglomerate Paleozoic schist 173 Xo Octoraro Formation Probably lower Albite-chlorite schist Phyllite Hornblende gneiss Paleozoic

9 MAP UNITNO SYMBOL NAME AGE LITH1 LITH2 LITH3 174 Xwk Wakefield Marble Probably lower Marble Paleozoic 175 Xsc Sams Creek Metabasalt Probably lower Metabasalt Paleozoic 176 Xgw "Glenarm Wissahickon" Probably lower Oligoclase-mica schist Hornblende Gneiss; amphibolite formation Paleozoic gneiss 177 Xw Wissahickon Formation Probably lower Oligoclase-mica schist Hornblende Gneiss Paleozoic gneiss 178 Xc Cockeysville Marble Probably lower Marble Paleozoic 179 Xsq Setters Quartzite Probably lower Feldspathic quartzite Mica gneiss Mica schist Paleozoic 180 mb Metabasalt Metabasalt 181 mr Metarhyolite Precambrian Metarhyolite 182 vs Greenstone schist Precambrian Greenstone schist 183 md Metadiabase Precambrian Metadiabase 184 a Anorthosite Precambrian Anorthosite 185 gqm Graphitic felsic gneiss Precambrian Graphitic felsic gneiss Mafic gneiss

186 ggd Felsic and intermediate gneiss Precambrian Felsic gneiss Intermediate gneiss 187 gga Banded mafic gneiss Precambrian Mafic gneiss Felsic gneiss 188 gg Graphitic felsic gneiss Precambrian Graphitic gneiss Felsic gneiss 189 fm Franklin Marble Precambrian Graphitic marble 190 fgh Felsic and intermediate gneiss Precambrian Felsic gneiss Intermediate gneiss 191 fgp Felsic gneiss Precambrian Felsic gneiss 192 hg Hornblende gneiss Precambrian Mafic gneiss 193 mgh Mafic gneiss Precambrian Mafic gneiss Amphibolite 194 mgp Mafic gneiss Precambrian Mafic gneiss 195 gn Felsic to mafic gneiss Precambrian Felsic gneiss Intermediate Mafic gneiss gneiss

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